Automatic switch for telegraph-receiving systems.



C. B. COOK.

AUTOMATIC swncH FOR TELEGRAPH news/me sYsYEms.

APPLICATION FILED JULY 12. 1916- v Patented Nov. 13, 1917.

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AUTOMATIC SWITCH FOR TELEGRAPH RECEIVING SYSTEMS.

APPLICATION FILED JULY I2. 1916. h 1,246,551 Patented Nov. 13, 1917.

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A TTORNE Y8 I UNITED STATES PATENT OFFICE.

.GLAIBORN BURTON COOK, F FOREMAN, ARKANSAS, ASSIGNOR OF ONE-HALF TO GEORGE L.FELTON,.OF ARKIN'DA, ARKANSAS.

AUTOMATIC swrrcn ronmELEonarn-nmmvinc srsrnns,

" Ajpp'l ioationfiledJul 12,1916. Serialilio. 108,308.

To all whom it may concern:

'Be it known that I, CLAIBORN B. 000K,

- a citizen of the United States, and'a-resident of Foreman, in the county of Little River and State of Arkansas, have invented a'certain new and useful Improvement in Auto- "matic Switchesfor Telegraph-Receiving Systems; and it"consists' in the combinations,

constructions, and. arran gements' hereinafter described andclaimed.

Anobject of my "inventlon is to provlde an automatic switch for connecting thellnes successively with a sounder.

A further'objectof my invention-is to provide a simple device for switching one circuit and then another to'the sounder.

Other objects and advantages will appear in the following specification andthe novel features of the inventionwill be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings formingpart of this application, and in which:

I igure .1 ,is a diagrammatic view of the circuit connection;

Fig. 2 is a section on the Fig. 7

Fig. 3 is a perspective view of a port ion of the switch;

Fig. 4 is a detail view of the brushes;

Fig. 5 is a perspective view of a ack used in connection with the device;

Fig. 6 is a perspective view of the switch; and

Fig. 7 is a sectional view through the switch.

In telegraph oflices where one operator works more than one wire, it is customary to use a resonator containing the telegraph sounders and to connect the various lines periodically with the resonator in order that the operator may be sure of getting his call from any of the lines. The switching of any particular line on to the resonator or sounder circuit is accomplished by means of a jack or plug. Since the sound of the resonator will drown the sound of the instrument on any other line, the operator must go to the switch at intervals and switch the current on from the other lines to the resonator in order to ascertain if he has been called, or if he is being called. \Vhere the operator has to attend to other duties, it will be readily seen that this is a matter that requires considerable time.

line 2 2% 1 ps eifi et of le q er te fir The purpose of myinvention is to provide a device which will automatically connect a sounder lfirst with oneline and then with another in succession, so that *the operator does not have to make this connection himself. 1

Referring now particularly to Fig. 7, I

5 llIVQSllOWll therein a clock train A. It will "be understood,however, that "any motor might-be substituted for the clock train with- This clock train includes a earB, which is mounted on a shaft Chavmg an insulating sleeve D surrounded by a, conduct- 120 apart. I

A second shaft. is provided with an insulating sleeve Gto which are pivotally mount ed brushes 9 9 and g respectively. 5 Thesebrushes are held by a spring H in contactwith'the sleeve -D or the sleeveqE andthe spring has an adjusting device K.

As'wil be seen in 'Figi' '7, the'casing L isprovided with three binding posts 1, 2

and 3, respectively, which are connected by means of conductors l, 2, and 3, respectively, with corresponding binding posts 1, 2", and 3? (see Fig. 2). Wires 1*, W, and 3 connect the brushes g g and g respectively. The sleeve E on the shaft C is electrically grounded with the frame of the clockwork. A conductor 5 connects the binding posts with the frame of the clockwork. A switch arm connects the binding post 6 with any of the three binding posts 1*, 2 and 3*, by moving the switch to the corresponding binding post. The clockwork frame is also connected by means, of a conductor 8 with a jack 9 whose spring 10 is connected by a conductor 11 with the battery 13. This battery B is a local battery and the sounder S is in circuit with the battery. The Wires 12, 13 and 1% lead from the relays I, II, and III, and connect with the binding posts 1, 2 and 3, respectively.

From the foregoing description of the device, the operation will be readily understood. The spring is wound, or if a motor is used, it is set going, and the shaft C revolves, thus bringing the brushes g g and 9 into contact with the conducting sleeve E, successively. Only one brush is in contact with this conducting portion at one [out departing fromthe spirit of the invention.

time, the other two being on insulated portions, so that the local circuit is connected with the relays I, II, III in succession, and,

for a predetermined period. Assuming that the switch makes a complete round of the wires, say every 21 seconds, the switch will be on number 1 wire seven seconds, on number 2 seven seconds, and on number 3, seven seconds, being off each wire fourteen seconds. It will be readily seen that one would have to call the operator less than fourteen seconds at most without coming onto the resonator circuit. This arrangement leaves the operator free to attend to other duties in the knowledge that when his call comes, he will hear it.

In the event that it is desirable to keep one of the relays in permanent connection with the local circuit containing the sounder,

I may move the handle 7 to the corresponding binding post 1", 2 or 8*, thus grounding the, relay on the frame of the motor.

The jack shown at 9 and 10 is for the pur I pose of connecting any other line in the portions, said shaft being. driven by said ordinary malmer by plugging in at the opening inthe casing L, this opening being shown in Fig. 5. v

I claim: a

1. An automatic switch comprising a frame, a motor carried thereby, arevolving shaft having insulating and conducting Copies of this patent may be obtained for motor, an auxiliary shaft, an insulating sleeve carried by said auxiliary shaft, :1 plu rality of brushes carried by said insulating sleeve and arranged to engage said firstnamed shaft, each brush engaging first the conducting portion and then the insulating portion of the shaft during the rotation of the latter, and means for maintaining the brushes in engagement with the revolving shaft. n

2. An automatic switch comprising a frame, a motor carried thereby, a revolving shaft having insulating and conducting portions, said shaft being driven by said a motor, an auxiliary shaft, an insulating CLAIBORN BURTON COOK.

Witnesses to signature: R. E. BOWLES, L. M. 0001;.

five cents each, by addressing the Commissioner of Patentl, Washington, D. G. 

